1621246143555 has 16 divisors (see below), whose sum is σ = 2882215366560. Its totient is φ = 864664609824.

The previous prime is 1621246143551. The next prime is 1621246143571. The reversal of 1621246143555 is 5553416421261.

1621246143555 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 24 + 614 + 3 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 1621246143555 - 2² = 1621246143551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1621246143555.

It is not an unprimeable number, because it can be changed into a prime (1621246143551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6004615212 + ... + 6004615481.

It is an arithmetic number, because the mean of its divisors is an integer number (180138460410).

Almost surely, 2^{1621246143555} is an apocalyptic number.

1621246143555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1621246143555 is a deficient number, since it is larger than the sum of its proper divisors (1260969223005).

1621246143555 is a wasteful number, since it uses less digits than its factorization.

1621246143555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12009230707 (or 12009230701 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 1621246143555 in words is "one trillion, six hundred twenty-one billion, two hundred forty-six million, one hundred forty-three thousand, five hundred fifty-five".